February 18, 1955 
Dr. Roy Lyman Sexton 
Suite 1*U>, Washington Medical Building 
1801 Eye Street, M. W. 
Washington 6, D. C. 
Dear Dr. Sexton: 
I take great pleasure in appointing you a collaborator 
of the Smithsonian Institution to serve with the forthcoming 
Smiibsonian-Bredln expedition to the Belgian Congo. lour 
presence as medical officer and official photographer will 
greatly enhance the achievement of the members of this 
expedition. 
The group, which you have so kindly consented to join, 
will assemble in Leopoldville on or about April 11* and will 
return via the Egyptian Sudan, Cairo, and Hew York, to 
Washington about June ?0. For the duration of t.ie journey 
the Smithsonian wi.l assume the expense of your travel, 
subsistence and lodging , Washington to Washington. 
I wish here to express my sincere appreciation of the 
generous contribution of your personal time and effort to 
the success of the expedition. May it be all that we 
anticipate. 
Cordially yours. 
Leonard Carmichael 
Secretary 
